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Packing as a probe of structure in alkaline earth glass systems

机译:包装作为碱土玻璃系统中结构的探针

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摘要

Packing is an intrinsic property of glass, defined as the ratio of ionic volume to molar volume, and is a useful parameter for analyzing structural changes with composition. Alkali based glasses show two trends in packing, one dominated by the oxygen covalent network for the small ions, Li and Na, and one ionically dominated by the metal cations for the large, K, Rb and Cs cases [S. Giri, C. Gaebler, J. Helmus, M. Affatigato, S.A. Feller, J. Non-Cryst. Solids 347 (2004) 87]. We have found that alkaline earth glasses do not display these behaviors, and in this paper we determined the packing fractions of these glasses and compared them with the alkali case. Further, we considered the structural implications of the packing trends. (c) 2008 Elsevier B.V. All rights reserved.
机译:堆积是玻璃的固有特性,定义为离子体积与摩尔体积之比,并且是分析组成随组成变化的有用参数。基于碱的玻璃显示出两种堆积趋势,对于大的K,Rb和Cs情况,一种由小离子Li和Na的氧共价网络控制,而另一种由金属阳离子的离子控制[S. Giri,C.Gaebler,J.Helmus,M.Affatigato,S.A。Feller,J.Non-Cryst。固体347(2004)87]。我们发现碱土玻璃没有表现出这些行为,在本文中,我们确定了这些玻璃的填充分数,并将其与碱金属情况进行了比较。此外,我们考虑了包装趋势的结构含义。 (c)2008 Elsevier B.V.保留所有权利。

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